DESCRIPTION

The Portable System Controller is a circuit which incorporates many of the functions necessary for low power portable products integrated into one chip. The DS1673 provides a Real Time Clock, NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter. Communication ith the DS1673 is established through a simple 3-wire interface.

FEATURES

■ Provides Real Time Clock:

– Counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap year compensation valid up to 2100

– Power control circuitry supports system

power on from day/time alarm

■ Microprocessor monitor:

– Halts microprocessor during power-fail

– Automatically restarts microprocessor after power failure

– Monitors pushbutton for external override

– Halts and resets an out of control microprocessor

■ NV RAM control:

– Automatic battery backup and write protection to external SRAM

■ 3-channel, 8-bit analog-to-digital converter

■ Simple 3-wire interface

■ +3.0 or +5.0V operation